Abstract Laser beam cladding is a versatile method for the deposition of functional surface layers, the generation of prototypes and the repair welding of components. It is a thermal process characterized by a highly localized energy input. The powder-fed laser beam cladding process uses CO2- and, more recently, Nd:YAG- and direct diode lasers at a typical processing speed within 0.3 and 1.5 m/min. The present work investigates the extension of process parameters towards significantly higher speed and thermal efficiency. In this study, a focused Nd:YAG laser beam was used, which produces a small melt pool. Furthermore high processing speed leads to interaction times in the range of milliseconds. With minimal overall heat input, functional layers with a thickness of tenths of millimeters are obtained and the surface area processed per time unit is increased. Paper text in German.

Abstract Ni and Ti aluminides show a high potential for lightweight applications at elevated temperatures. The strength of TiAl can be increased, if directionally solidified structures are producable. Recent developments of superalloys show that the laser rapid prototyping can be used to generate directionally solidified parts. To generate directionally solidified TiAl parts, first the problem of crack formation has to be solved. The solution was developed by the use of Ti48Al2Cr alloy and an adjusted cooling of the sample. Second the process parameters have to be chosen in a way, that directional solidification occurs. For this a macroscopic process simulation including the modeling of the feedstock material and a microstructure simulation is build up. The correlation of experiments and simulation will lead to process guidelines for laser rapid prototyping of directionally solidified TiAl parts. Paper text in German.